T-square.



v. KRAJIEEK.

T-SQUARE.

APPLICATION FILED our. 11, 1909.

970,625. Patented Sept.20, 1910.

M; L3 L!:LiillJill.LLLUXQII UNITED s'rA'rns PATENT, OFFICE.

VINGENC KRAJICEK, OF PARDUBITZ, AUSTRIA-HUNGARY.

ID-SQUARE.

To all whom it may concern:

Be it known that I, VINCENO KRAJIGEK, commercial traveler, a subject ofthe Austro- Hungarian Emperor, and resident of 767 Sladkovskystrasse,Pardubitz, Bohemia, Austria-Hungary, have invented an InnprovedT-Square, of which the following is a specification.

This invention has for its object to combine the auxiliary means whichare neces sary for drawing angles of given size, with the T-square insuch a way that they form a handy whole with the latter.

The invention consists substantially in a second rule being combinedwith the blade of the T-square, which second rule is intended to replacethe ordinary triangle or other set square, and for this purpose isarranged so as to be revoluble over a circular scale and also adapted toslide along the blade of the T-squa-re.

An example of construction of the invention is shown in the accompanyingdrawings, in which Figure 1 is a plan view; and Fig. 2, a section on theline A-B of Fig. 1.

The blade 1 of the T-square is provided with a longitudinal slot 2 whichserves for guiding a slide piece 3. A disk 4 is firmly connected withthe latter and between the slide piece 3 and the disk 4, a rule 5 isprovided said rule 5 being pivoted on the sliding piece 3. The disk 4 isprovided with a Specification of Letters Patent.

Application filed October 11, 1909.

Patented Sept. 20, 1910.

Serial No. 522,099.

circular scale, of which only some divisional lines are shown, while therule 5 is provided with a gage mark 7 This in combination with the dialor divided circle 8 allows of the rule 5 being adjusted to make anydesired angle with the blade 1. A pointer or indicator 9 is provided onthe upper side of the disk 4 the said pointer being pivoted on the pin6, which pointer may be adjusted to a division 10 of the blade 1. Thisallows of parallel lines being drawn with the rule 5 at a given mutualdistance apart without separate instruments, such as compasses or thelike, being necessary.

Having fully described my invention, what I claim and desire to secureby Letters Patent is:

In an improved T-square, the combination of a graduated blade having alongitudinal slot, a piece adapted to slide in the slot, a graduateddisk secured to said piece, a rule pivoted on said piece and interposedbetween the latter and the disk, a pin carried by the disk, and apointer carried on the pin, substantially as described and shown and forthe purpose set forth.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

VINGENC KRAJICEK. \Vitnesses ALEXANDER Fnonmcn, FRANZ MARK.

